Fuzz testing debug tool

Add code to run a fuzz tester, simulating (more-or-less) random
keyboard mashing. There's no option to turn it on, you need to
set iflags.debug_fuzzer on via a debugger or something along
those lines.

win/tty/termcap.c

@@ -748,6 +748,8 @@ tty_delay_output()
 #if defined(MICRO)
     register int i;
 #endif
+    if (iflags.debug_fuzzer)
+        return;
 #ifdef TIMED_DELAY
     if (flags.nap) {
         (void) fflush(stdout);

win/tty/topl.c

@@ -186,6 +186,8 @@ more()
     /* avoid recursion -- only happens from interrupts */
     if (ttyDisplay->inmore++)
         return;
+    if (iflags.debug_fuzzer)
+        return;
 
     if (ttyDisplay->toplin) {
         tty_curs(BASE_WINDOW, cw->curx + 1, cw->cury);

win/tty/wintty.c

@@ -3344,6 +3344,9 @@ tty_nhgetch()
      */
     if (WIN_MESSAGE != WIN_ERR && wins[WIN_MESSAGE])
         wins[WIN_MESSAGE]->flags &= ~WIN_STOP;
+    if (iflags.debug_fuzzer) {
+	i = randomkey();
+    } else {
 #ifdef UNIX
     i = (++nesting == 1) ? tgetch()
                          : (read(fileno(stdin), (genericptr_t) &nestbuf, 1)
@@ -3352,6 +3355,7 @@ tty_nhgetch()
 #else
     i = tgetch();
 #endif
+    }
     if (!i)
         i = '\033'; /* map NUL to ESC since nethack doesn't expect NUL */
     else if (i == EOF)